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$A$ can finish a work in $12$ days and $B$ can do it in $15$ days. After $A$ had worked for $3$ days, $B$ also joined $A$ to finish the remaining work. In how many days, the remaining work will be finished?

1. $5\dfrac{1}{2} \\$
2. $4\dfrac{1}{2} \\$
3. $5$
4. $6$

option C is right
by
168 points

1